Marketable Securities (Details) (Macerich Interest [Member], USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Macerich Interest [Member]
Investment Holdings [Line Items]
Macerich Common Shares	535,265	535,265
Economic basis per share (in dollars per share)	$ 56.05
GAAP Cost	$ 30,000,000
Fair Value	31,522,000	31,206,000
Closing share price (in dollars per share)	$ 58.89	$ 58.30
Unrealized Gains	$ 316,000	$ 1,206,000